Operational Intelligence: Using Pinot as Backend for Timeseries Data

We have a request to use pinot to process time series data. This issue will track the progress of adding time series functionality to Pinot.

The issue names no files, tests, or entry points. Start by reviewing Pinot's existing time-series data capabilities and determine the required processing and storage changes. Done is not defined beyond adding time-series functionality, so acceptance criteria and a scoped implementation plan are needed first.

Written by the indexing model from the issue text.